Friction release for axminster looms



Oct 9 1923. 7 1,470,007

1.. B. JENCKES FRICTION RELEASE FOR AXMINSTER LOOMS Filed Dec.

31. 1921 2 Sheets-Sheet 1 Oct. 9 1923. 1,470,007

L. B. JENCKES FRICTION RELEASE FOR AXMINSTER LOOMS Filed Dec- 31. 1921 2 Sheets-Sheet 2 Patented Get. 9, 1923.

its sri LAWRENCE B. JENCKES, OF 'WORCESTER,.MASSACHUSETTS, ASSIGNOR TO CROIVIFTONflo KNOWLES LOOMVTORKS, OF WORCESTER,

MASSACHUSETTS;

FRICTION RELEASE FOR AXMInsTER Looms.

Application filed December 31, 1921.

in operative position. It is also customary to hold the chain by friction during the in sertion of the yarn. constitutes" a severe load on the driving mechanism and it is extremely desirableto lighten this load as much as possible.

Accordingly it 'is the object of-my invention to provide means for automatically and periodically releasing the friction at the moment when the chain is advanced.

My invention further relates to friction I devices having provision for both manual and automatic release.

Further features of. my invention relate.

to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A. preferred form of my invention is shown in the drawings in which Fig. 1 is a sectional side elevation of parts of a loom, taken along the line 1--1 in Fig. 2;

Fig. 2 is a partial front elevation With certain parts in section, taken along the line 22 in Fig. 1;

3 is an enlarged front elevation of the friction and release devices; and

Fig. 4 is a side elevation thereof.

Referring to the drawings, I have shown parts of a loom frame 10 on which is rotatably mounted a. pattern chain driving shaft 11 provided with sprockets 12 by which the chain is moved. The shaft 11 may be intermittently advanced in either direction by pawls, not shown, co-operating with ratchet wheels on the shaft. These pawls are mounted on levers 13 and 14 movable about the axis of the shaft 11 and connected This'chain must be intermittently advanced topresent successive tube frames The chain itself' now Serial no. 526,297.

by links 15 and 16 to a bell-crank'17. The crank 17 is provided with-1a 'cam' roll. l8idis-i posed in a'cam groove 19 in. the side of a cam. 20 mounted on the lower or cam shaft of the loom.

MASSACHUSETTS, A, oonrona rron or The arms 13 and14xare thus moved intermittently and provision s 'inade for rendering either pawl. operative to advance the shaft 11.

For further details of the shaft actuatingg mcchanismyreferenceis made to the'copending application of E. H. Ryon, SerialeNo.

560,211, filed May 11,1922.-

The shaft 11 is provided near one end with a friction wheel or pulley 21 (Fig: 3) which is engaged by' a pair of friction arms 22. and

23 (Fig. 4). The arms 22 and '23 are 111V.

otally connected at 24 and are providedwith. facings' 25-0f leather or other suitable ifricf. The facingsi25 are pressed against the pulley 21 by. a spring-26 mountti on material.

ed on a bolt 27 extending.v through: cars :28 atthe lower ends of he arms :22 and'23. The upper ends of the arms 22 and 23 embrace a cross girt 30 forming a part of the frame 10 and are thus held from rotation with the shaft 11.

Provision is made as follows for manually releasing the friction :-A recess 31 is formed between the ears 2S and a stud 32 is mounted in said recess. the outer end of the stud being provided with a handle 33. The sides of the stud 32 are flattened so that the stud presents a substantially rectangular cross-section.

When the handle 33 is in the position.

shown in full lines in Fig. 4, the stud 32 is loosely held in the recess 31 and the friction arms engage the pulley 21. The friction may be released, however, by turning the handle 33 to the position shown in dotted lines in Fig. 4. The stud 32 will then be disposed with its longer diameter crosswise of the recess 31 and the arms 22 and 23 will be forced apart to release the friction. The manual release above described is useful whenever the weaver finds it necessary to turn the pattern chain in one directlon or the other, as in case of a mispick.

I have also provided means for automatically releasing the friction whenever the chain is advanced by the pawl and ratchet feed. This automatic release mechanism comprises a rectangular block 34 mounted on a fixed stud and positioned between the arms 22 and 23. An arm 36 is fixed to the block 34 and is connected by a link 37, a lever 88 and a link 39 to a lever 40 pivoted at 41 to the loom frame 10 and having a cam roll co-operating with a cam 42 also mounted on the lower cam shaft of the loom. At each rotation of the cam shaft, the cam 42 depresses the lever 40 and swings the arm 36 upward, turning the block 34 to a diagonal position between the arms 22 and 23 and thus forcing the arms apart to release the friction. The cams are so timed that the automaticfriction release occurs at the precise time When the feed paWls become operative to advance the chain. Ihe load upon the operating mechanism is thus materially decreasedf It is desirable that the handle be of substantial weight, so that the manual release mechanism \lll move to the inoperative position shown in full lines in Fig. 4 whenever the arms 22 and 23 are separated by the automatic release mechanism.

Having thus described my invention, it will be evident that changes and. modifications may be made therein by those skilled in the art Within the spirit and scope of my invention as set forth in the claims, and I do not wish to be otherwise limited to the details herein disclosed, but what I claim is: 1. In a loom, a tube chain driving shaft, means'to advance said shaft intermittently, a friction device for said shaft, and automatic means to release said friction as said shaft is advanced.

2. In a loom, a tube chain driving shaft, means to advance said shaft intermittently, a friction device for said shaft, automatic means to release said friction as said shaft is advanced, and additional means for manually releasing said friction.

3. In a loom, a tube chain driving shaft, means to advance said shaft intermittently in a selected direction, a friction wheel on said shaft, friction arms normally engaging said Wheel, and automatic means to separate said arms as the shaft is moved.

4. In a loom, a tube chain driving shaft, means to advance said shaft intermittently in a selected direction, a friction wheel on said shaft, friction arms normally engaging said wheel, a block mounted between said arms, and periodically actuated means to turn said block and separate said arms to re lease the friction as said shaft is moved.

5. In a loom, a tube chain driving shaft, means to advance said shaft intermittently, a friction device for said shaft, manual means to release the friction, and automati means to release the friction, said manual means moving to inoperative position whenever the friction is released by the automatic means.

In testimony whereof I have hereunto affixed my signature.

LAWRENCE B. JENCKES. 

